A lot of people don't have access to a lot of different pins to try. So they are trying to gain insight of what others think. To help them decide.
And like any critic. Find one with similar tastes to yours. If he likes pin A, pin B, and pin C. And you like pin A and pin B, then you'd probably like pin C too.
With the cost of games these days. All the research you can do is important.
LTG : )